[aprssig] Current path
Rodge Jones
g0cjm at live.com
Tue Mar 9 09:08:26 EST 2010
Current mobile/fixed paths are as follows allowing for excellent Igate and Digi.
Path: APRS,WIDE*,WIDE6-6: sometimes here i try out CQ,ARISS* but with little success.
Very best wishes/Tres meilleurs sentiments,
Rodge
Rodge E. JONES G0CJM G6XCJ [g0cjm at live.com]
07928-252-090 [or] 07805-85-44-26*
*NOT available outside Britain.
Path outside Britain: CQ,ARISS* (Simplex 145.825Mhz)
radio location: www.aprs.fi/g0cjm-9 (sometimes -12)
Prof. R.E.JONES PJM(1962)HMAF(Vtn) Physics & Solar-flux.
Je parle francais et Chinois de Canton. I am a linguist in SIX languages. these include Cantonese and Malay.
Due to war firefight both legs are amputated and hearing lost (Borneo 1962).
Life-Member:RMPA. Member:CTS.,RGJRA.,G-QRP.,OCA43rd & 52nd.,BRARS.
Private & Confidential to addressee. DPA 1998 HRA 1998
R S V P !!
> From: aprssig-request at tapr.org
> Subject: aprssig Digest, Vol 69, Issue 9
> To: aprssig at tapr.org
> Date: Tue, 9 Mar 2010 12:00:02 +0000
>
> Send aprssig mailing list submissions to
> aprssig at tapr.org
>
> To subscribe or unsubscribe via the World Wide Web, visit
> https://www.tapr.org/cgi-bin/mailman/listinfo/aprssig
> or, via email, send a message with subject or body 'help' to
> aprssig-request at tapr.org
>
> You can reach the person managing the list at
> aprssig-owner at tapr.org
>
> When replying, please edit your Subject line so it is more specific
> than "Re: Contents of aprssig digest..."
>
>
> Today's Topics:
>
> 1. Re: Color Display (Shawn Stoddard)
> 2. Re: APRS Messenger PSK-63 On The Air Reports -- Magnetic Loop
> Antenna Now Up (Stephen H. Smith)
> 3. Re: APRS Messenger PSK-63 On The Air Reports -- Magnetic Loop
> Antenna Now Up (Lynn W. Deffenbaugh (Mr))
> 4. Re: APRS Messenger PSK-63 On The Air Reports -- Magnetic Loop
> Antenna Now Up (Stephen H. Smith)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Mon, 8 Mar 2010 08:28:57 -0500
> From: Shawn Stoddard <stoddard at pobox.com>
> Subject: Re: [aprssig] Color Display
> To: TAPR APRS Mailing List <aprssig at tapr.org>
> Message-ID: <20100308132907.894EB94955 at b-sasl-quonix.pobox.com>
> Content-Type: text/plain; charset="iso-8859-1"
>
> This is research for a new piece of software. I recall having seen something on aprs.org regarding how tro display the icon for station to show more than location. I'll keep digging.
>
>
> -----Original Message-----
> From: Curt, WE7U <curt.we7u at gmail.com>
> Sent: Sunday, March 07, 2010 11:04 PM
> To: TAPR APRS Mailing List <aprssig at tapr.org>
> Subject: Re: [aprssig] Color Display
>
> On Sun, 7 Mar 2010, Lynn W. Deffenbaugh (Mr) wrote:
>
> > Shawn Stoddard wrote:
> >> I recall seeing something about the color of a station indicating how
> >> recently it has been heard from. Anybody know where I might have seen this?
> >
> > It would help to know what APRS software you are referring to with this
> > question. The display of a station, particularly its color, is up to the
> > software and not part of the APRS protocol spec itself, although Bob
> > Bruninga's APRSdos had some color coding that it did, but I don't believe it
> > was based on age, but on capabilities.
>
> Xastir has a mode: "Display last report age", which displays minutes
> since the station was last heard. That text starts out green,
> changes to yellow after some number, then red some minutes after
> that. The intent was to help check up on SAR personnel more often
> via voice-checks if they weren't being heard from on APRS. If the
> age goes yellow, call then on voice. If it goes red, perhaps have
> another team check on them.
>
> --
> Curt, WE7U. <http://www.eskimo.com/~archer>
> APRS: Where it's at! <http://www.xastir.org>
> Lotto: A tax on people who are bad at math. - unknown
> Windows: Microsoft's tax on computer illiterates. - WE7U.
> The world DOES revolve around me: I picked the coordinate system!"
>
> _______________________________________________
> aprssig mailing list
> aprssig at tapr.org
> https://www.tapr.org/cgi-bin/mailman/listinfo/aprssig
>
>
>
>
>
> ------------------------------
>
> Message: 2
> Date: Mon, 08 Mar 2010 14:41:51 -0800
> From: "Stephen H. Smith" <wa8lmf2 at aol.com>
> Subject: Re: [aprssig] APRS Messenger PSK-63 On The Air Reports --
> Magnetic Loop Antenna Now Up
> To: TAPR APRS Mailing List <aprssig at tapr.org>
> Message-ID: <4B957D2F.3060106 at aol.com>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> [ 14:30 Pacific Time (02:27 UTC) Monday 8 Mar]
>
> I have successfully built, tuned and erected a homebrew magnetic loop
> antenna this afternoon. I now have this antenna connected to the
> TS-50 that is monitoring 10.149 APRS (Both AX.25 FSK and PSK63).
> This replaces the homebrew vertical dipole made from two 30M mobile
> HamSticks that I have been using up til now. The HF all-us map
> display on my web server at:
>
> <http://wa8lmf.dyndns.org:14439>
>
> is now using the new loop antenna.
>
> The first thing I noticed is that the natural background hiss and "band
> noise" heard with the new antenna dropped about 1 S-unit compared to the
> dipole. However, the TV sync hash from a leaking cable TV trunk, and
> AC hum and buzz that I was hearing on the dipole has completely
> disappeared. I appear to have a far higher signal-to-noise ratio than
> before.
>
> I expect that the small (1 meter diameter) resonant loop will have far
> better high-angle reception than the vertical dipole. I should be able
> to hear stations up and down the west coast (i.e. a relatively short
> haul of 400-1000 miles) much better.
>
> Eagerly awaiting the stations from the midwest and east coast that
> normally start showing up about 16:00 local time.
>
> Details on this dirt-cheap easy-to-build compact antenna for 30 meters
> (that could be stealthed in an attic) will follow in a week or so.
>
> ------------------------------------------------------------------------
>
> --
>
> Stephen H. Smith wa8lmf (at) aol.com
> EchoLink Node: WA8LMF or 14400 [Think bottom of the 2M band]
> Skype: WA8LMF
> Home Page: http://wa8lmf.net
>
> NEW! Universal HF/VHF/UHF Antenna Mounting System
> http://wa8lmf.net/mobile/UniversalAntMountSystem.htm
>
> "APRS 101" Explanation of APRS Path Selection & Digipeating
> http://wa8lmf.net/DigiPaths
>
> Updated "Rev H" APRS http://wa8lmf.net/aprs
> Symbols Set for UI-View,
> UIpoint and APRSplus:
>
>
>
>
>
> ------------------------------
>
> Message: 3
> Date: Mon, 08 Mar 2010 17:53:27 -0500
> From: "Lynn W. Deffenbaugh (Mr)" <ldeffenb at homeside.to>
> Subject: Re: [aprssig] APRS Messenger PSK-63 On The Air Reports --
> Magnetic Loop Antenna Now Up
> To: TAPR APRS Mailing List <aprssig at tapr.org>
> Message-ID: <4B957FE7.2020003 at homeside.to>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> Stephen H. Smith wrote:
> > Eagerly awaiting the stations from the midwest and east coast that
> > normally start showing up about 16:00 local time.
> > Details on this dirt-cheap easy-to-build compact antenna for 30
> > meters (that could be stealthed in an attic) will follow in a week or so.
>
> And I'm eagerly awaiting the antenna details! I just posted a request
> for 30m antenna suggestions to another group and received some
> suggestions, but I'm looking to go cheap, dirt-cheap is even better!
> Any early hints or links so I can start to get a handle on what to
> expect? Even if it's a reference to a page number or article title at
> arrl.net or the 2010 Handbook, I'm all eyes!
>
> Lynn (D) - KJ4ERJ-1 - IGating 10.147.600 both AX.25 and PSK-63 from Palm
> Bay, FL USA (EL97qx)
>
> PS. See http://tinyurl.com/IGATE-KJ4ERJ-1 for recently heard stations
>
>
>
>
>
> ------------------------------
>
> Message: 4
> Date: Mon, 08 Mar 2010 16:01:10 -0800
> From: "Stephen H. Smith" <wa8lmf2 at aol.com>
> Subject: Re: [aprssig] APRS Messenger PSK-63 On The Air Reports --
> Magnetic Loop Antenna Now Up
> To: TAPR APRS Mailing List <aprssig at tapr.org>
> Message-ID: <4B958FC6.3080506 at aol.com>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> Lynn W. Deffenbaugh (Mr) wrote:
> > Stephen H. Smith wrote:
> >> Eagerly awaiting the stations from the midwest and east coast that
> >> normally start showing up about 16:00 local time. Details on this
> >> dirt-cheap easy-to-build compact antenna for 30 meters (that could
> >> be stealthed in an attic) will follow in a week or so.
> >
> > And I'm eagerly awaiting the antenna details! I just posted a request
> > for 30m antenna suggestions to another group and received some
> > suggestions, but I'm looking to go cheap, dirt-cheap is even better!
> > Any early hints or links so I can start to get a handle on what to
> > expect? Even if it's a reference to a page number or article title at
> > arrl.net or the 2010 Handbook, I'm all eyes!
> >
> > Lynn (D) - KJ4ERJ-1 - IGating 10.147.600 both AX.25 and PSK-63 from
> > Palm Bay, FL USA (EL97qx)
> >
> > PS. See http://tinyurl.com/IGATE-KJ4ERJ-1 for recently heard stations
> >
> >
> >
> > _______________________________________________
> > aprssig mailing list
> > aprssig at tapr.org
> > https://www.tapr.org/cgi-bin/mailman/listinfo/aprssig
>
> I'd do a web page on it now, but I'm getting ready for the IWCE
> (International Wireless Communications Expo) in Las Vegas this week.
>
>
> Basically, a "magnetic loop" antenna is a very small (relative to
> wavelength) single-turn loop tuned to resonance with a series
> capacitor. A second, much smaller loop connected directly to a coax
> feed line is placed inside the larger loop, nearly tangent to the first
> loop at the side opposite the capacitor. This small loop forms the
> primary winding of an air-core RF transformer with the larger loop
> forming the secondary winding
>
>
> Such a device can be nearly as efficient on transmit as a full-sized
> dipole -IF- the loop and capacitor are very efficient and low loss.
> The MFJ "Super-HI-Q Loop" antenna and the old AEA "IsoLoop" are
> commercial versions of such an antenna that are tunable between 10 to 30
> MHz. With a 100 watt transmitter, HUNDREDS of RF amps circulate in the
> loop and 4,000-to-10,000 volts can appear across the capacitor.
>
>
> My loop is constructed of 3/8" soft copper "refrigeration tubing" from
> Home Depot. Ten feet of this are bent into a circular loop about 1
> yard in diameter. The support is a vertical mast made from a piece
> of 1" Sched 40 PVC water pipe. with two 3/8" holes drilled through it's
> diameter about 37" apart.
>
>
> The trick was the capacitor. Normally, mag loop ants use motorized
> high-voltage butterfly, split-stator variable caps or variable vacuum
> caps to tune the loop to resonance while withstanding very high RF
> voltages. (I.e. the kind of variable caps you see in high power antenna
> tuners.) Since I didn't need the antenna to be tunable (it's going to
> set to a single spot frequency (10.149 MHz) permanently, I calculated
> the required capacitance and set out to create a cheap fixed-value cap
> with 4-5 KV breakdown.
>
>
> The inside diameter of the 3/8" tubing is an EXACT fit for the center
> conductor and dielectric of RG-8 or RG-213 coax. I stripped the outer
> jacket and braid off 37" of RG-213 cable and then stripped the
> dielectric off half an inch of the remaining insulated center
> conductor. I soldered the exposed half-inch of the cable to the INSIDE
> of one end of the loop tubing. (You'll need a old-fashioned 150
> soldering iron or a Berz-O-Matic torch to heat up the copper tubing
> (not a wimpy electronics pencil or temp-controlled soldering station)
> since the copper is such a good conductor of heat! I then jammed the
> remaining 36 1/2" of dielectric-covered center conductor into the open
> other end of the copper tubing. Push it in until the loop is nearly
> closed with only a 1/4" so so gap between the two ends.
>
>
> This construction creates a coaxial capacitor with the coax cable center
> conductor being one plate and the INSIDE of the copper tubing being the
> other plate. The 36" or so of cable inside the tubing creates a
> capacitance of about 75pF required to resonate the loop. Normal 50-ohm
> coax has a capacitance of about 30-33 pF/foot. The snug fit between
> the center conductor/dielectric, and the inside diameter of the tubing,
> very closely duplicates the geometry, and thus capacitance of the
> original coax . (You could literally make your own copper hardline
> from this tubing by pushing yards and yards of center
> conductor/dielectric from RG/8, RG/213 or RG/214 into it.)
>
>
> You tune the loop to exact resonance by pulling the loop apart, or
> pushing the loop together exposing more or less of the coax cable.
> (Only the portion of the coax opposite the tubing's inside diameter
> contributes to the capacitor value.) In my model, I had to expose about
> 3/8" of the dielectric to get to 10.149 MHz. The tuning is VERY sharp
> (indicating hi Q and high efficiency). A change of 1/8th inch moves the
> resonance about 100Kz. The bandwidth for 2:1 SWR is only about 12
> KHz. This is actually an advantage for single frequency operation -
> the antenna is so selective that transmitting on other HF bands
> simultaneously won't desensitize the 30M receiver at all.
>
>
> Finally, create the coupling loop. I cut 22" of normal #14 THHN copper
> house wire, formed it into a loop approximately 7-1/2" diameter and
> soldered the ends to the center conductor and braid of any convenient
> length of 50-ohm coax to reach to the radio. This loop is then placed
> so that it is about 1/4" away from the inside circumference of the large
> loop on the side opposite the open-ends/capacitor. I drilled a couple
> of additional holes in the PVC pipe to support the small loop in the
> proper orientation. By bending (distorting this circle) so that more or
> less of it is closely parallel to the big loop, you fine-tune the SWR at
> resonance. Mine has an SWR of under 1.5:1 at resonance.
>
> ------------------------------------------------------------------------
>
>
>
>
> ------------------------------
>
> _______________________________________________
> aprssig mailing list
> aprssig at tapr.org
> https://www.tapr.org/cgi-bin/mailman/listinfo/aprssig
>
>
> End of aprssig Digest, Vol 69, Issue 9
> **************************************
_________________________________________________________________
Hotmail: Powerful Free email with security by Microsoft.
https://signup.live.com/signup.aspx?id=60969
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.tapr.org/pipermail/aprssig_lists.tapr.org/attachments/20100309/a3e4a929/attachment.html>
More information about the aprssig
mailing list